<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <form action="/" method="post">
        <input type="text" class="user" name="username"><span>用户名</span>
        <input type="password" class="pass" name="mima"><span>密码</span>
        <input type="submit" value="确定">
    </form>
</body>
</html>